package com.hades.utils;
import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.pool.DruidDataSourceFactory;

import java.io.InputStream;
import java.sql.*;
import java.util.Properties;

public class JdbcUtils {
    private static DruidDataSource dataSource;

    private JdbcUtils(){}

    static {
        try {
            Properties properties = new Properties();
            InputStream inputStream = JdbcUtils.class.getClassLoader().getResourceAsStream("jdbc.properties");
            properties.load(inputStream);
            dataSource = (DruidDataSource) DruidDataSourceFactory.createDataSource(properties);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 获取数据库连接池
     * @return 如果返回null，说明获取连接失败<br/>有值就是获取连接成功
     */
    public static Connection getConnection() {
        Connection conn = null;
        try{
            conn = dataSource.getConnection();
        }catch (Exception e){
            e.printStackTrace();
        }
        return conn;
    }

    /**
     * 关闭连接，放回数据库连接池
     * @param conn
     */
    public static void close(Connection conn){
        if(conn != null){
            try {
                conn.close();
            } catch (SQLException throwables) {
                throwables.printStackTrace();
            }
        }
    }
}
